how to benchmark ubuntu RAID setup ( 1 Views )

1. how would i go about doing this? someone said use the DD command but i dont know extaclty how to use it. wouldnt anyone know how i would test it's speeds?
   
   
   Thanks
   
   
   (ali, United States)


2. Bonnie++ is one, plus both myself and Unhappy_mage has tested a could cards with it.
   
   Search through Unhappy's posts to find the useage and results of the one line DD script.
   
   
   (seher, Austria)


3. what parameters do i use with dd command to run some test ?
   
   
   (tuncay, Gibraltar)


4. Another command you can run is:
   
   hdparm -Tt /dev/md0 (or whatever you raid disk is)
   
   /dev/md0:
   Timing cached reads: 2784 MB in 2.00 seconds = 1391.91 MB/sec
   Timing buffered disk reads: 340 MB in 3.02 seconds = 112.73 MB/sec
   
   
   (Çaðrý, France)


5. child of wonder how did you optimize you raid system to be that fast?
   
   
   (büþra, Azerbaijan)


6. my sda1 parition is much faster then my md0, why ?
   
   
   (melisa, Bolivia)


7. Quote:

   Originally Posted by zman099 child of wonder how did you optimize you raid system to be that fast?

   *shrug* lol
   
   I didn't optimize anything. The drives are Seagate 500GB 16MB cache PATA and there are 2 in RAID 0 running software RAID.
   
   The 16MB cache on each is probably what gets the cached read so high.
   
   I also set the chunk size of the RAID array to 64k since I store a lot of large files on them.
   
   
   (murat, Portugal)


8. Quote:

   Originally Posted by zman099 my sda1 parition is much faster then my md0, why ?

   How fast is your system? CPU, RAM?
   
   Software RAID performance is dependent on your system, too.
   
   
   (bilge, Honduras)


9. actually md0 is faster now, i must of been copying something at the sametime when i was benchmarking it.
   
   
   its a 2.8ghz p4 with 512ram and 1 74gig raptor and 1 250gig 7200rpm WD hd
   
   
   (çaðdaþ, Suriname)


10. Which are you running in RAID?
    
    That system shouldn't bottleneck your performance.
    
    
    (ahmet, Cameroon)


11. raid0 i dont know how to tweak the performance out of it, but i set it up as raid 0 when i installed ubuntu .
    
    
    (abdullah, Tanzania, United Republic of)


12. Are you running the 74GB and 250GB in RAID 0 together?
    
    
    (kazým, Ecuador)


13. yes but i parition parts of it not to be in RAID. only my /home is in RAID.
    
    
    (umut, Northern Mariana Islands)


14. That's your problem right there.
    
    While you can set up RAID with different disks and only certain partitions, you're going to take a large performance hit for doing so.
    
    You're probably better off using LVM if you need the space combined into one larger volume for /home.
    
    
    (fatih, Andorra)

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